It seems like it's the same for PnS and DSLR. Built in flash's light triggers slave flashes. If one wants RF/IR, then he has to get RF/IR triggers (transmitter and receiver) and hook them up with the DSLR and external flash.
Thats correct. I have manual flash and camera's builtin flash can trigger it but I don't use it because, first camera's battery drains faster, second builtin flash hits directly to the subject/object causing harsh light and third it takes more time to set correct exposure.
later I have got wireless flash trigger (JJC JF-U1 to be specific) and it helps me a lot. Not just for off camera flash but also it works as wired/wireless shutter release. It supports upto 16 channels but I have only one receiver and one flash unit. For two flash units, you need to buy JF-U2 or more receivers which are sold separately. Works with almost all dslr camera brands but you have to buy specific Shutter Release Cable to use wired shutter release remote.
Note: TTL/iTTL won't work when flash unit is connected through wireless flash trigger.
Commander flash is a great addition, no need to get expensive master flash like 580ex/600ex (or at least this was the case before until 430ex RT). Even Nikon P7800 has this, I don't know why Nikon is not adding this in D3xxx or D5xxx when they do so in a compact camera.
Now Canon's 430ex RT/600ex RT comes with builtin RF, so no need to get third party triggers and the new 430 is not slave any more.
I tried to learn about commander mode from different but it seems complex and some people have confused commander mode as slave mode but actually both are different.
In slave mode, we use camera's pop-up flash to trigger the flash unit and we manual analyze how much flash power is required and set accordingly on the flash unit.
Whereas in commander mode, the camera can wirelessly communicate with flash unit. It still fires pop-up flash but only to analyze how much power is required and it sets the correct setting on off camera flash unit before taking the final shot. That means two shots are taken (first one is to analyze but won't be saved in memory) and if you disable pop-up flash in commander mode settings then pop-up flash won't fired in final shot.
Now some flash units won't work with commander mode (camera's builtin RF), especially 3rd party and we have to use wireless flash triggers.
This is what I have understood but I'm not so sure about it.
Nac I saw dual kit lens with 1200D for 20k at flipkart ...this is too much . If I was a newbie I would have grabbed this.
I'm not happy with flipkart/amazon products pricing. They are not firm with their offers. Not just in this festive sales but every time. Frequently changing price tags without even thinking how it feels to the buyers.
I have bought 32gb Sandisk OTG USB 3.0 pendrive from amazon in this festival offer (lighting deal) and next day they dropped the price by 50 Rs. This is just a small item but how it feels if you buy a expensive product and it costs less tomorrow.
Also I have seen lower price tags in normal days, eg. I got my D3200 for 19k and now it costs 25k on flipkart and little less on amazon. Don't you think it is priced very high? After all its a 4 year old model.
Flipkart, Amazon and etc do so much showoff but won't improve to delivery services. They have come across so many festival sales, lighting sales, flash sales and what not but delivery timing is still worst. I have seen plenty of complaints about amazon prime stating items not being delivered in time, then why to pay extra for fast delivery?
Above said item was ordered on 2nd Oct and still not dispatched. Expected delivery date is 13th and I'm sure it will reach me after that date.
Its festive for them and waiting for us!